"Kandagawa Jet Girls" is set in a world where high-speed watercraft racing, known as Jet Racing, has become a popular sport. The sport involves teams of two—a Rider, who controls the jet ski, and a Shooter, who uses water-based weapons to disrupt opponents and protect their own team. The story centers on Rin Namiki, a cheerful and determined girl who moves to Kandagawa City to pursue her dream of becoming a professional Jet Racer. Rin’s mother was a legendary Jet Racer, and Rin aspires to follow in her footsteps.

Upon arriving in Kandagawa, Rin meets Misa Aoi, a skilled but reserved Shooter who initially hesitates to team up with her. Despite their differences, the two form a partnership and begin competing in Jet Racing tournaments. Their journey involves overcoming personal challenges, building trust, and improving their teamwork as they face off against rival teams, each with their own motivations and backstories. Among these rivals are the wealthy and confident Jenna Morrison and her partner, Emily Orange, as well as the mysterious and highly skilled duo of Kaguya Jinguji and Panopticon.

The series explores themes of friendship, perseverance, and the pursuit of dreams, as Rin and Misa navigate the competitive world of Jet Racing. Their bond deepens as they train together, strategize, and learn from their victories and defeats. The narrative also delves into the backgrounds of other characters, providing insight into their reasons for participating in the sport and their relationships with their teammates.

As the story progresses, Rin and Misa aim to climb the ranks of the Jet Racing world, ultimately striving to compete in the prestigious Kandagawa Championship. The series balances action-packed racing sequences with moments of character development, showcasing the growth of the protagonists and their rivals alike. Through teamwork and determination, Rin and Misa work to prove themselves in a sport that demands both skill and heart.